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Return the currently active request or None if no request
is currently active.

This function should be used extremely sparingly, usually only
in unit testing code. It's almost always usually a mistake to use
get_current_request outside a testing context because its
usage makes it possible to write code that can be neither easily
tested nor scripted.

Return the currently active application registry or the
global application registry if no request is currently active.

This function should be used extremely sparingly, usually only
in unit testing code. It's almost always usually a mistake to use
get_current_registry outside a testing context because its
usage makes it possible to write code that can be neither easily
tested nor scripted.